Cool, thanks. Any experience with either of these?
Been using Exped Downmats for a few years now. No problems, other than a bit of familiarity needed to get the best way of inflating them. Well worth the effort and transformed my experience of wildcamping.
I tried a Pacific Ether mummy-shaped inflatable but missed the extra space. I never tried it out in the wild. Sold it on.
Had a Neo-air for a bit. Very light and compact but the horizontal baffles made the mat feel a bit unstable and I tended to fall off it in the night. Sold it on.
So Exped has been the manufacturer of choice. My wife used to really struggle to get a night's sleep car-camping (she doesn't backpack) until she tried an Exped Downmat. Of all the bits of kit I've tried over the years, the Downmat is the one that has made the biggest improvement to comfort. They're not the lightest or cheapest mats out there and of course they're more easily punctured than a closed cell foam mat so you do need to be a bit careful where you pitch but with lightweight tents you have to be careful anyway.
Weight is much less of an issue than it used to be - a full length Exped UL Downmat is down to 565g now and you can take a lighter sleeping bag as most heat is lost through the ground.